package com.common;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.apache.commons.lang3.StringUtils;

public class DateUtil {
	
	
	public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
	public static final String MINUTE_PATTERN = "yyyy-MM-dd HH:mm";
	public static final String HOUR_PATTERN = "yyyy-MM-dd HH:mm:ss";
	public static final String DATE_PATTERN = "yyyy-MM-dd";
	public static final String MONTH_PATTERN = "yyyy-MM";
	public static final String YEAR_PATTERN = "yyyy";
	public static final String MINUTE_ONLY_PATTERN = "mm";
	public static final String HOUR_ONLY_PATTERN = "HH";

	/**
	 * 日期相加减天数
	 * @param date 如果为Null，则为当前时间
	 * @param days 加减天数
	 * @param includeTime 是否包括时分秒,true表示包含
	 * @return
	 * @throws ParseException 
	 */
	public static Date dateAdd(Date date, int days, boolean includeTime) throws ParseException{
		if(date == null){
			date = new Date();
		}
		if(!includeTime){
			SimpleDateFormat sdf = new SimpleDateFormat(DateUtil.DATE_PATTERN);
			date = sdf.parse(sdf.format(date));
		}
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.DATE, days);
		return cal.getTime();
	}

	/**
	 * 时间格式化成字符串
	 * @param date Date
	 * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN， 如果为空，则为yyyy-MM-dd
	 * @return
	 * @throws ParseException
	 */
	public static String dateFormat(Date date, String pattern) throws ParseException{
		if(StringUtils.isBlank(pattern)){
			pattern = DateUtil.DATE_PATTERN;
		}
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		return sdf.format(date);
	}

	/**
	 * 字符串解析成时间对象
	 * @param dateTimeString String
	 * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN，如果为空，则为yyyy-MM-dd
	 * @return
	 * @throws ParseException
	 */
	public static Date dateParse(String dateTimeString, String pattern) throws ParseException{
		if(StringUtils.isBlank(pattern)){
			pattern = DateUtil.DATE_PATTERN;
		}
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		return sdf.parse(dateTimeString);
	}

	/**
	 * 将日期时间格式成只有日期的字符串（可以直接使用dateFormat，Pattern为Null进行格式化）
	 * @param dateTime Date
	 * @return
	 * @throws ParseException
	 */
	public static String dateTimeToDateString(Date dateTime) throws ParseException{
		String dateTimeString = DateUtil.dateFormat(dateTime, DateUtil.DATE_TIME_PATTERN);  
		return dateTimeString.substring(0, 10); 
	}

	/**
	 * 当时、分、秒为00:00:00时，将日期时间格式成只有日期的字符串，
	 * 当时、分、秒不为00:00:00时，直接返回
	 * @param dateTime Date
	 * @return
	 * @throws ParseException
	 */
	public static String dateTimeToDateStringIfTimeEndZero(Date dateTime) throws ParseException{
		String dateTimeString = DateUtil.dateFormat(dateTime, DateUtil.DATE_TIME_PATTERN);
		if(dateTimeString.endsWith("00:00:00")){
			return dateTimeString.substring(0, 10);
		}else{
			return dateTimeString;
		}
	}

	/**
	 * 将日期时间格式成日期对象，和dateParse互用
	 * @param dateTime Date
	 * @return Date
	 * @throws ParseException
	 */
	public static Date dateTimeToDate(Date dateTime) throws ParseException{
		Calendar cal = Calendar.getInstance();
		cal.setTime(dateTime);
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		return cal.getTime();
	}

	/** 
	 * 时间加减小时
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param hours 加减的小时 
	 * @return Date 
	 */  
	public static Date dateAddHours(Date startDate, int hours) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.HOUR, c.get(Calendar.HOUR) + hours);  
		return c.getTime();  
	}

	/**
	 * 时间加减分钟
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param minutes 加减的分钟
	 * @return
	 */
	public static Date dateAddMinutes(Date startDate, int minutes) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.MINUTE, c.get(Calendar.MINUTE) + minutes);  
		return c.getTime();  
	}

	/**
	 * 时间加减秒数
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param minutes 加减的秒数
	 * @return
	 */
	public static Date dateAddSeconds(Date startDate, int seconds) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.SECOND, c.get(Calendar.SECOND) + seconds);  
		return c.getTime();  
	}

	/** 
	 * 时间加减天数 
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param days 加减的天数 
	 * @return Date 
	 */  
	public static Date dateAddDays(Date startDate, int days) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.DATE, c.get(Calendar.DATE) + days);  
		return c.getTime();  
	}

	/** 
	 * 时间加减月数
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param months 加减的月数 
	 * @return Date 
	 */  
	public static Date dateAddMonths(Date startDate, int months) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.MONTH, c.get(Calendar.MONTH) + months);  
		return c.getTime();  
	}

	/** 
	 * 时间加减年数
	 * @param startDate 要处理的时间，Null则为当前时间 
	 * @param years 加减的年数 
	 * @return Date 
	 */  
	public static Date dateAddYears(Date startDate, int years) {  
		if (startDate == null) {  
			startDate = new Date();  
		}  
		Calendar c = Calendar.getInstance();  
		c.setTime(startDate);  
		c.set(Calendar.YEAR, c.get(Calendar.YEAR) + years);  
		return c.getTime();  
	}  

	/** 
	 * 时间比较（如果myDate>compareDate返回1，<返回-1，相等返回0） 
	 * @param myDate 时间 
	 * @param compareDate 要比较的时间 
	 * @return int 
	 */  
	public static int dateCompare(Date myDate, Date compareDate) {  
		Calendar myCal = Calendar.getInstance();  
		Calendar compareCal = Calendar.getInstance();  
		myCal.setTime(myDate);  
		compareCal.setTime(compareDate);  
		return myCal.compareTo(compareCal);  
	}

	/**
	 * 获取两个时间中最小的一个时间
	 * @param date
	 * @param compareDate
	 * @return
	 */
	public static Date dateMin(Date date, Date compareDate) {
		if(date == null){
			return compareDate;
		}
		if(compareDate == null){
			return date;
		}
		if(1 == dateCompare(date, compareDate)){
			return compareDate;
		}else if(-1 == dateCompare(date, compareDate)){
			return date;
		}
		return date;  
	}

	/**
	 * 获取两个时间中最大的一个时间
	 * @param date
	 * @param compareDate
	 * @return
	 */
	public static Date dateMax(Date date, Date compareDate) {
		if(date == null){
			return compareDate;
		}
		if(compareDate == null){
			return date;
		}
		if(1 == dateCompare(date, compareDate)){
			return date;
		}else if(-1 == dateCompare(date, compareDate)){
			return compareDate;
		}
		return date;  
	}

	/**
	 * 获取两个日期（不含时分秒）相差的天数，不包含今天
	 * @param startDate
	 * @param endDate
	 * @return
	 * @throws ParseException 
	 */
	public static int dateBetween(Date startDate, Date endDate) throws ParseException {
		Date dateStart = dateParse(dateFormat(startDate, DATE_PATTERN), DATE_PATTERN);
		Date dateEnd = dateParse(dateFormat(endDate, DATE_PATTERN), DATE_PATTERN);
		return (int) ((dateEnd.getTime() - dateStart.getTime())/1000/60/60/24); 
	}

	/**
	 * 获取两个日期（不含时分秒）相差的天数，包含今天
	 * @param startDate
	 * @param endDate
	 * @return
	 * @throws ParseException 
	 */
	public static int dateBetweenIncludeToday(Date startDate, Date endDate) throws ParseException {  
		return dateBetween(startDate, endDate) + 1;
	}

	/**
	 * 获取日期时间的年份，如2017-02-13，返回2017
	 * @param date
	 * @return
	 */
	public static int getYear(Date date) {  
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		return cal.get(Calendar.YEAR);
	}

	/**
	 * 获取日期时间的月份，如2017年2月13日，返回2
	 * @param date
	 * @return
	 */
	public static int getMonth(Date date) {  
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		return cal.get(Calendar.MONTH) + 1;
	}

	/**
	 * 获取日期时间的第几天（即返回日期的dd），如2017-02-13，返回13
	 * @param date
	 * @return
	 */
	public static int getDate(Date date) {  
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		return cal.get(Calendar.DATE);
	}

	/**
	 * 获取日期时间当月的总天数，如2017-02-13，返回28
	 * @param date
	 * @return
	 */
	public static int getDaysOfMonth(Date date) {  
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		return cal.getActualMaximum(Calendar.DATE);
	}

	/**
	 * 获取日期时间当年的总天数，如2017-02-13，返回2017年的总天数
	 * @param date
	 * @return
	 */
	public static int getDaysOfYear(Date date) {  
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		return cal.getActualMaximum(Calendar.DAY_OF_YEAR);
	}

	/**
	 * 根据时间获取当月最大的日期
	 * <li>2017-02-13，返回2017-02-28</li>
	 * <li>2016-02-13，返回2016-02-29</li>
	 * <li>2016-01-11，返回2016-01-31</li>
	 * @param date Date
	 * @return
	 * @throws Exception 
	 */
	public static Date maxDateOfMonth(Date date) throws Exception {
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		int value = cal.getActualMaximum(Calendar.DATE);
		return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
	}

	/**
	 * 根据时间获取当月最小的日期，也就是返回当月的1号日期对象
	 * @param date Date
	 * @return
	 * @throws Exception 
	 */
	public static Date minDateOfMonth(Date date) throws Exception {
		Calendar cal = Calendar.getInstance();  
		cal.setTime(date);
		int value = cal.getActualMinimum(Calendar.DATE);
		return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
	}
	
	public static long calBetweenSecond(Date date1,Date date2){
		return (date2.getTime()-date1.getTime())/1000;
	}
}
